Those of you Mac users who worked with a previous version of Mac OS X may have been able to use the “Save As” command to save that document under a different name or in a different Folder. But this feature is missing on Lion and newer versions of Mac OS X and may confuse those of you who “climbed the operating-system ladder” by installing subsequent versions of MacOS X on your Macintosh.
But you can bring back this function through a procedure that is very simple. Here, you bring up the File menu as normal then press the Option key on your keyboard where the option that was previously “Duplicate File” becomes “Save As”. Click on this or subsequently press Command–Shift–S together to bring up the Save As dialog box so you can save it under a different name.
This function is important if you have to create a new different version of that document or wish to save it in a particular location like a removable drive or a special folder and you realise you needed to do this after the fact.